XML 91 R84.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Share-Based Compensation Share-Based Compensation (Summary of Grants) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation [Abstract] |  |  |
Performance Vesting Restricted Stock Units, Three-Year Performance Period Ending, Years | 2016 | 2015 | 2014
Granted, Shares | 86,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 80,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 80,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Performance Vesting Restricted Stock Units, Vesting Shares, Maximum | 162,188 mcy_PerformanceVestingRestrictedStockUnitsVestingSharesMaximum | 181,125 mcy_PerformanceVestingRestrictedStockUnitsVestingSharesMaximum | 181,125 mcy_PerformanceVestingRestrictedStockUnitsVestingSharesMaximum

X
- Definition Performance vesting restricted stock units, three-year performance period ending, years. + References No definition available. + Details
Name: | mcy_PerformanceVestingRestrictedStockUnitsThreeYearPerformancePeriodEndingYears
Namespace Prefix: | mcy_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Performance vesting restricted stock units, vesting shares, maximum. + References No definition available. + Details
Name: | mcy_PerformanceVestingRestrictedStockUnitsVestingSharesMaximum
Namespace Prefix: | mcy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration